There is a very good reason the specifications are printed/etched onto the devices.

Plugging these devices into the mains can constitute a wilful act and any damage caused by doing so and will not be covered by insurance.Personal injuries to third parties can be considered as assault. (Failing to make safe)

So if you manage to cause a fire – personal injury etc then the insurance companies are not required to pay outYou may loose any future insurance cover you may wish to have because you have proven yourself to be a risk taker.